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December 1582 Calendar Shift
- When
- 9–20 December 1582
- Where
- France
France transitioned to the Gregorian calendar in December 1582, with 9 December followed by 20 December.
The French government adopted the new calendar a few months after the initial October change. The specific transition occurred when 9 December was followed immediately by 20 December, implementing the modification introduced by the papal bull.
Sources
- Gregorian calendar Wikipedia, revision of 2026-09-11
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.